One of the properties of the Web Part has an incorrect
format. Windows SharePoint Services cannot deserialize the
Web Part. Check the format of the properties and try
again. - this error is occured in Sharepoint 2007 while
deploy the web part
Answer / manoj dagar
This web part has some permission level problem, it solved
with change the location of build of your web part project.
By default project build in its own bin folder but you need
to change it to site bin folder
Project Bin - %root%/ProjectName/Bin/Dll - dll after build
Site Bin - %root%\Inetpub\wwwroot\wss\VirtualDirectories\%
Build the project - Copy the dll from Project Bin folder to
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